Added acceptance tests for API gateway

ECOM-3957

Makefile

 .DEFAULT_GOAL := test
 
-.PHONY: clean compile_translations dummy_translations extract_translations fake_translations help html_coverage \
+.PHONY: accept clean compile_translations dummy_translations extract_translations fake_translations help html_coverage \
 	migrate pull_translations push_translations quality requirements production-requirements test \
 	update_translations validate
 
 help:
 	@echo "Please use \`make <target>' where <target> is one of"
 	@echo "  help                       display this help message"
+	@echo "  make accept                run acceptance tests"
 	@echo "  clean                      delete generated byte code and coverage reports"
 	@echo "  compile_translations       compile translation files, outputting .po files for each supported language"
 	@echo "  dummy_translations         generate dummy translation (.po) files"
@@ -48,8 +49,8 @@ test: clean
 	coverage report
 
 quality:
-	pep8 --config=.pep8 course_discovery *.py
-	pylint --rcfile=pylintrc course_discovery *.py
+	pep8 --config=.pep8 acceptance_tests course_discovery *.py
+	pylint --rcfile=pylintrc acceptance_tests course_discovery *.py
 
 validate: test quality
 
@@ -84,3 +85,6 @@ start-devstack:
 open-devstack:
 	docker-compose --x-networking up -d
 	docker exec -it course-discovery env TERM=$(TERM) /edx/app/discovery/devstack.sh open
+
+accept:
+	nosetests --with-ignore-docstrings -v acceptance_tests

acceptance_tests/config.py

+import os
+
+API_GATEWAY_DISCOVERY_ROOT = os.environ.get('API_GATEWAY_DISCOVERY_ROOT')
+if not API_GATEWAY_DISCOVERY_ROOT:
+    raise RuntimeError('API_GATEWAY_DISCOVERY_ROOT (e.g. https://api.edx.org/discovery/v1) must be supplied!')
+
+DISCOVERY_API_ACCESS_TOKEN = os.environ.get('DISCOVERY_API_ACCESS_TOKEN')
+if not DISCOVERY_API_ACCESS_TOKEN:
+    raise RuntimeError('DISCOVERY_API_ACCESS_TOKEN must be supplied!')
+
+CATALOG_ID = int(os.environ.get('CATALOG_ID', 1))
+COURSE_ID = os.environ.get('COURSE_ID', 'edX/DemoX')
+COURSE_RUN_ID = os.environ.get('COURSE_RUN_ID', 'course-v1:edX+DemoX+Demo_Course')

acceptance_tests/test_api_gateway.py

+""" Tests to validate configuration of the API gateway. """
+from unittest import TestCase
+
+import ddt
+import requests
+
+from acceptance_tests.config import API_GATEWAY_DISCOVERY_ROOT, DISCOVERY_API_ACCESS_TOKEN, CATALOG_ID
+
+
+@ddt.ddt
+class ApiGatewayTests(TestCase):
+    PATHS = (
+        'catalogs/',
+        'catalogs/{id}/'.format(id=CATALOG_ID),
+    )
+
+    def get_discovery_api_gateway_url(self, path):
+        """ Returns a complete URL for the given path, routed through the API gateway. """
+        return '{root}/{path}'.format(root=API_GATEWAY_DISCOVERY_ROOT.rstrip('/'), path=path)
+
+    def assert_api_response(self, path, expected_status_code=200, **headers):
+        """
+        Verify the API returns HTTP 200.
+
+        Arguments:
+            path(str) -- Path of the API endpoint to call.
+            expected_status_code (int) -- Expected HTTP status code of the API response.
+            headers (dict) -- Headers to pass with the request.
+        """
+        url = self.get_discovery_api_gateway_url(path)
+        response = requests.get(url, headers=headers)
+        self.assertEqual(response.status_code, expected_status_code)
+
+    @ddt.data(*PATHS)
+    def test_endpoint_ok(self, path):
+        """ Verify the endpoint returns HTTP 200 for valid requests. """
+        headers = {
+            'Authorization': 'Bearer {token}'.format(token=DISCOVERY_API_ACCESS_TOKEN)
+        }
+        self.assert_api_response(path, **headers)
+
+    @ddt.data(*PATHS)
+    def test_endpoint_not_authorized(self, path):
+        """ Verify the endpoint returns HTTP 403 for unauthorized requests. """
+        self.assert_api_response(path, expected_status_code=403)